Logout.php

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<?php
namespace Magento\Backend\Controller\Adminhtml\Auth;

use Magento\Framework\App\Action\HttpGetActionInterface as HttpGet;
use Magento\Framework\App\Action\HttpPostActionInterface as HttpPost;

class Logout extends \Magento\Backend\Controller\Adminhtml\Auth implements HttpGet, HttpPost
{
    public function execute()
    {
        $this->_auth->logout();
        $this->messageManager->addSuccessMessage(__('You have logged out.'));

        $resultRedirect = $this->resultRedirectFactory->create();
        return $resultRedirect->setPath($this->_helper->getHomePageUrl());
    }
}